Improvement in rock-drilling machines



lillli-VARO i@ ifi i liti i? iii teureren @ritten iid CKWLLING MACHlNES.

dominee-tion :forming peri of Letteis Patent No. nlhdf?, dated January 9.6, 1875; application tiled January e, 1814.

esten, :in the eeuni'y ci iziul'oik and of Mees chueet'ts, here invented cers in Rocitrilliug lvifieliines,

L of drill tooi attached ig; yifitonrofl; und

the increment ot' the i u yyeculiuf: inn-mier ci leusliione.-

'i eyiiu-'ier und lentement applied thereto; dhe suine on the iiudinui central :if o; i Mg. 5, u; "e of the onine.

.presente the eyiinder, in which the reine' piston mounted; il', the pietonteiidiifn; uutthrewgh :i funding-hex on the heed oi me cylinder; und il, the toni cr drill-rod ett` i et' thc pietoni-od, the .fihoie constructed end :iriiitiiw'ei un um.` v the ey]- inder if I holte oi wie, E, extending' n, ion e redslfmount e, und '1e 'iiirmtn freund the und the letter in minime et' the trenini 'i 'tool or drill-red ,in su, the outer @ce et the piatte G l4 wohnt e. entitled vusl'zieuef ruhlief, l, eurl gg the pieton emi in the inner s plete nt it like cushion, Hiding 'i i rod, un shown. ic cud. oi i terni lieu-d ya" n nieves with first one tmzte being f, heed finish oi' the 'died to 'the eo uw ,ii-ge with the en? e piston in l with they are kept free from exposure to oil end heet.

I um :were that it is not new to employ cushions to check the movement of the piston; but heretofore they here beenple-ced Within the cylinder, whereby they were exposed to the action of heut and of the lubricating-oil', by which, in conjunction with the pounding action ci the piston, they were soon reduced to ai viscid non-elastic' mass, and rendered utterly useless. By ,my errungenient they ere removed from exposure to these destructive iniiuences, und caused to operate in a, more sutisfactory manner end for u greet length ci.' time..

In order that the cushions muy be adjusted the' plates in which they ure mounted are 'secured by nuts g, mounted on the rods E,

which are threaded, es shown, so that by turising the nuts the piates muy be moved, es required. It is obvious, however, that the pif-ttes muy bc secured by other fustenings, that they muy oe supported otherwise thun hy the rods, und that the piston and cushions may be varied in form und arrangement, es circumstances render advise-ble, provided the cushions are outside of the cylinder und serve to check the 'movement of the piston or toolrcd. The cushions in the present instance secured in the plates by being forced into und expanding within seats or recesses, which are enlarged toward thebottoin, als shown in Fig., 3.

if preferred, the shoulder or heed to strike the cushions muy be formed. on the tool or drill-rod instead of on the piston-rod.

in practice li construct the cylinder of severe-l transverse sections, in the patents heretofore grunted to me, und extend the rods lengthwise through the suine to the renr end of the cylinder, so that they serve to hold the sections together us `well us to support the cushions.

it is obvious that instead of securing the cushions to the plates they may be secured to the piston-rod, und urrzmged to comein contact with the plates.

Lleving described myinrentionm'hut i. Glenn inw 1. In combination with the cylinder and piston of n rockdrilling machine one or moreL 2. In combinintiomvthe cylinder and piston.

of a rock-drilling machine afcushion or eushions, supported by the cylnnler'and arranged to check the movement of the pistonrod, substantially as shown.

3. The combination f the cylinder A, piston-rod B, rods E, plates G H, nuts' g o1' equivalent fastening devices, and the cushions constructed and arranged substantially as described. v

Y EDWARD s. WiNGnEsTnn, Witnesses:

' C. 0. L. DiLLAWAY,

.WALTER A. TRIP?. 

